Hamilton American Classic Jazzmaster Automatic Chronograph H32606585 Men's WatchFor tough men, when on their acoustic sides! The Jazzmaster has already earned accolades for their elaborated sleekness in a simple, classic appearance. So the Jazzmaster Auto Chrono comes forth to take the Jazzmaster series a step higher. The simple, refined style keeps touch with its refined pedigree while a highly efficient Valjoux7750-based H-21 automatic movement powers its functions. A full charge lasts for 60 hours; thanks to the longer mainspring storing a higher power reserve. An overall increase in accuracy and stability is guaranteed by the glittered spiral and the unique, H-shaped automatic device bridge.